To fetch water before breakfast seemed to me a rule__________. [ ]
A.
to never break
B.
never to be broken
C.
never to have broken
D.
never to be breaking
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举一反三
【单选题】The purpose of a temperature sensing device installed in the stack of a small automatically fired auxiliary steam boiler is to secure the oil burner .
A.
in the event of a flame failure
B.
in the event of a stack fire
C.
when the water level reach the crown sheet
D.
when the feed pump discharge pressure drops to a preset minimum